﻿// jPaginate Plugin for jQuery
// by Angel Grablev for Enavu Web Development network (enavu.com)
// Dual license under MIT and GPL :) enjoy
/*

To use simply call .paginate() on the element you wish like so:
$("#content").jPaginate(); 

you can specify the following options:
items = number of items to have per page on pagination
next = the text you want to have inside the text button
previous = the text you want in the previous button
active = the class you want the active paginaiton link to have
pagination_class = the class of the pagination element that is being generated for you to style
minimize = minimizing will limit the overall number of elements in the pagination links
nav_items = when minimize is set to true you can specify how many items to show
cookies = if you want to use cookies to remember which page the user is on, true by default

*/
(function ($) {
    $.fn.jPaginate = function (options) {
        var defaults = {
            items: 4,
            next: "Next",
            previous: "Previous",
            active: "active",
            pagination_class: "pagination",
            minimize: false,
            nav_items: 6,
            cookies: true
        };
        var options = $.extend(defaults, options);

        return this.each(function () {
            // object is the selected pagination element list
            obj = $(this);
            // this is how you call the option passed in by plugin of items
            var show_per_page = options.items;
            //getting the amount of elements inside parent element
            var number_of_items = obj.children().size();
            //calculate the number of pages we are going to have
            var number_of_pages = Math.ceil(number_of_items / show_per_page);

            //create the pages of the pagination
            var array_of_elements = [];
            var numP = 0;
            var nexP = show_per_page;
            //loop through all pages and assign elements into array
            for (i = 1; i <= number_of_pages; i++) {
                array_of_elements[i] = obj.children().slice(numP, nexP);
                numP += show_per_page;
                nexP += show_per_page;
            }

            // display first page and set first cookie
            if (options.cookies == true) {
                if (get_cookie("current")) {
                    showPage(get_cookie("current"));
                    createPagination(get_cookie("current"));
                } else {
                    set_cookie("current", "1");
                    showPage(get_cookie("current"));
                    createPagination(get_cookie("current"));
                }
            } else {
                showPage(1);
                createPagination(1);
            }
            //show selected page
            function showPage(page) {
                obj.children().hide();
                array_of_elements[page].show();
            }

            // create the navigation for the pagination 
            function createPagination(curr) {
                var start, items = "", end, nav = "";
                start = "<ul class='" + options.pagination_class + "'>";
                var previous = "<li><a class='goto_previous' href='#'>" + options.previous + "</a></li>";
                var next = "<li><a class='goto_next' href='#'>" + options.next + "</a></li>";
                var previous_inactive = "<li><a class='inactive'>" + options.previous + "</a></li>";
                var next_inactive = "<li><a class='inactive'>" + options.next + "</a></li>";
                end = "</ul>"
                var after = number_of_pages - options.after + 1;
                var pagi_range = paginationCalculator(curr);
                for (i = 1; i <= number_of_pages; i++) {
                    if (options.minimize == true) {
                        var half = Math.ceil(number_of_pages / 2)
                        if (i >= pagi_range.start && i <= pagi_range.end) {
                            if (i == curr) { items += '<li><a class="' + options.active + '" title="' + i + '">' + i + '</a></li>'; }
                            else { items += '<li><a href="#" class="goto" title="' + i + '">' + i + '</a></li>'; }
                        } else if (curr <= half) {
                            if (i >= (number_of_pages - 2)) {
                                if (i == curr) { items += '<li><a class="' + options.active + '" title="' + i + '">' + i + '</a></li>'; }
                                else { items += '<li><a href="#" class="goto" title="' + i + '">' + i + '</a></li>'; }
                            }
                        } else if (curr >= half) {
                            if (i <= 2) {
                                if (i == curr) { items += '<li><a class="' + options.active + '" title="' + i + '">' + i + '</a></li>'; }
                                else { items += '<li><a href="#" class="goto" title="' + i + '">' + i + '</a></li>'; }
                            }
                        }
                    } else {
                        if (i == curr) { items += '<li><a class="' + options.active + '" title="' + i + '">' + i + '</a></li>'; }
                        else { items += '<li><a href="#" class="goto" title="' + i + '">' + i + '</a></li>'; }
                    }
                }
                if (curr != 1 && curr != number_of_pages) {
                    nav = start + previous + items + next + end;
                } else if (curr == number_of_pages) {
                    nav = start + previous + items + next_inactive + end;
                } else if (curr == 1) {
                    nav = start + previous_inactive + items + next + end;
                }
                obj.after(nav);
            }

            /* code to handle cookies */
            function set_cookie(name, value) {
                $.cookie(name, value);
            }
            function get_cookie(cookie_name) {
                return $.cookie(cookie_name);
            }

            function paginationCalculator(curr) {
                var half = Math.floor(options.nav_items / 2);
                var upper_limit = number_of_pages - options.nav_items;
                var start = curr > half ? Math.max(Math.min(curr - half, upper_limit), 0) : 0;
                var end = curr > half ? Math.min(curr + half + (options.nav_items % 2), number_of_pages) : Math.min(options.nav_items, number_of_pages);
                return { start: start, end: end };
            }

            // handle click on pagination 
            $(".goto").live("click", function (e) {
                e.preventDefault();
                showPage($(this).attr("title"));
                set_cookie("current", $(this).attr("title"));
                $(".pagination").remove();
                createPagination($(this).attr("title"));
            });
            $(".goto_next").live("click", function (e) {
                e.preventDefault();
                var act = "." + options.active;
                var newcurr = parseInt($(".pagination").find(".active").attr("title")) + 1;
                set_cookie("current", newcurr);
                showPage(newcurr);
                $(".pagination").remove();
                createPagination(newcurr);
            });
            $(".goto_previous").live("click", function (e) {
                e.preventDefault();
                var act = "." + options.active;
                var newcurr = parseInt($(".pagination").find(".active").attr("title")) - 1;
                set_cookie("current", newcurr);
                showPage(newcurr);
                $(".pagination").remove();
                createPagination(newcurr);
            });
        });


    };
    jQuery.cookie = function (name, value, options) {
        if (typeof value != 'undefined') { // name and value given, set cookie
            options = options || {};
            if (value === null) {
                value = '';
                options.expires = -1;
            }
            var expires = '';
            if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
                var date;
                if (typeof options.expires == 'number') {
                    date = new Date();
                    date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
                } else {
                    date = options.expires;
                }
                expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
            }
            var path = options.path ? '; path=' + (options.path) : '';
            var domain = options.domain ? '; domain=' + (options.domain) : '';
            var secure = options.secure ? '; secure' : '';
            document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
        } else { // only name given, get cookie
            var cookieValue = null;
            if (document.cookie && document.cookie != '') {
                var cookies = document.cookie.split(';');
                for (var i = 0; i < cookies.length; i++) {
                    var cookie = jQuery.trim(cookies[i]);
                    // Does this cookie string begin with the name we want?
                    if (cookie.substring(0, name.length + 1) == (name + '=')) {
                        cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
                        break;
                    }
                }
            }
            return cookieValue;
        }
    };
})(jQuery);